EP0426237B1 - Procédé de détection de l'insuffisance de vide dans les tubes de télévision - Google Patents

Procédé de détection de l'insuffisance de vide dans les tubes de télévision Download PDF

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Publication number
EP0426237B1
EP0426237B1 EP90202833A EP90202833A EP0426237B1 EP 0426237 B1 EP0426237 B1 EP 0426237B1 EP 90202833 A EP90202833 A EP 90202833A EP 90202833 A EP90202833 A EP 90202833A EP 0426237 B1 EP0426237 B1 EP 0426237B1
Authority
EP
European Patent Office
Prior art keywords
tube
voltage
tubes
vacuum
procedure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90202833A
Other languages
German (de)
English (en)
Other versions
EP0426237A3 (en
EP0426237A2 (fr
Inventor
André Bolz
Hermann Dr. Wehr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0426237A2 publication Critical patent/EP0426237A2/fr
Publication of EP0426237A3 publication Critical patent/EP0426237A3/de
Application granted granted Critical
Publication of EP0426237B1 publication Critical patent/EP0426237B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/42—Measurement or testing during manufacture

Definitions

  • the invention relates to a method for selecting television picture tubes with too low a vacuum during manufacture.
  • it is important to discard all picture tubes with too low a vacuum in good time during the production process so that they are not changed by further production steps, e.g. gettering, in such a way that repairing / regenerating these tubes is made difficult or impossible becomes.
  • the invention is therefore based on the object of designing a method of the type mentioned at the outset in such a way that it works simply and safely and the selection of the tubes is practically not falsified by insulation currents.
  • This object is achieved according to the invention in that between the anode (g4) and a second electrode (g3) of the tube, a DC voltage which rises continuously from a low value to a maximum value is applied, the rise of which is stopped when a (spark) or discharge) current flows and the associated value of the DC voltage is evaluated as a criterion for the selection of the tube.
  • the insulation currents within the tube base are not included in the measurement result, and the measurement circuit can be constructed much more simply, since it is not a small current that has to be measured at a constant applied voltage, but only the point in time (and the associated voltage value) to which a current begins to flow in the tube.
  • the focusing electrode (g3) is preferably used as the second electrode.
  • the second and all further electrodes are preferably connected to ground potential.
  • the figure shows schematically an apparatus for performing the method according to the invention and a television picture tube connected to it.
  • the device 1 consists of a voltage generator 2 which generates a DC voltage which rises continuously from a low value to a maximum value and which is applied between the anode (g4) and the focusing electrode (g3) of the tube 4.
  • the focusing electrode is connected to earth potential together with all other electrodes (g3) filtered out on the base of the tube.
  • a detection circuit 3 is inserted, which emits a signal in its output S as soon as a current flows in the tube between the anode (g4) and the focusing electrode (g3) and causes the voltage U does not continue to rise.
  • the voltage U of the voltage generator 2 rises to its maximum value at a rate of approximately 3 kV / sec.
  • the voltage U generated by the voltage generator 2 is set such that, at its maximum value (for example 20 kV) in a tube with a good vacuum, no current flows between the anode (g4) and the focusing electrode (g3), which current in the detection circuit 3 leads to a signal at its output S.
  • the vacuum in the tube 4 is below a predetermined value (before gettering) of approximately 1 to 20 Pa, a current flows at a value of the voltage which is below the maximum value, which leads to a signal at the selection output S, which then triggers that this tube with bad vacuum is first removed from the production process.
  • a predetermined value before gettering
  • a current flows at a value of the voltage which is below the maximum value, which leads to a signal at the selection output S, which then triggers that this tube with bad vacuum is first removed from the production process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Claims (4)

  1. Procédé de sélection de tubes images de télévision à vide insuffisant, au cours de la fabrication, caractérisé en ce qu'on applique entre l'anode (g4) et une deuxième électrode (g3) du tube, une tension continue croissant continuellement d'une valeur basse jusqu'à une valeur maximum, on arrête cette croissance lorsque dans le tube passe un courant de décharge et on évalue la valeur correspondante de la tension continue en tant que critère pour la sélection du tube.
  2. Procédé selon la revendication 1, caractérisé en ce qu'on utilise comme deuxième électrode l'électrode de focalisation (g3).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'électrode de focalisation (g3) et toutes les autres électrodes (en dehors de l'anode) sont mises au potentiel de terre.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'on le réalise avant de soumettre les tubes à une sorption par getter.
EP90202833A 1989-10-28 1990-10-24 Procédé de détection de l'insuffisance de vide dans les tubes de télévision Expired - Lifetime EP0426237B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3936015 1989-10-28
DE3936015A DE3936015A1 (de) 1989-10-28 1989-10-28 Verfahren zum selektieren von fernsehbildroehren mit zu niedrigem vakuum

Publications (3)

Publication Number Publication Date
EP0426237A2 EP0426237A2 (fr) 1991-05-08
EP0426237A3 EP0426237A3 (en) 1991-11-21
EP0426237B1 true EP0426237B1 (fr) 1994-05-18

Family

ID=6392473

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90202833A Expired - Lifetime EP0426237B1 (fr) 1989-10-28 1990-10-24 Procédé de détection de l'insuffisance de vide dans les tubes de télévision

Country Status (4)

Country Link
US (1) US5083957A (fr)
EP (1) EP0426237B1 (fr)
JP (1) JPH03165422A (fr)
DE (2) DE3936015A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69304499T2 (de) * 1992-12-17 1997-03-13 Philips Electronics Nv Verfahren zum Aushärten eines Filmes
DE19526394A1 (de) * 1995-07-19 1997-01-23 Siemens Ag Verfahren zum Vakuumnachweis in betriebsmäßig eingebauten Vakuumschaltröhren
US6722184B2 (en) 2001-09-13 2004-04-20 Guide Corporation Apparatus and method for pressurized oxygen bulb curing and testing

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1592364A (en) * 1921-04-26 1926-07-13 Western Electric Co Ionization manometer
SU656126A1 (ru) * 1976-06-23 1979-04-05 Рязанский Радиотехнический Институт Схема дл измерени давлени в отпа нных электровакуумных приборах
US4052776A (en) * 1976-09-30 1977-10-11 Zenith Radio Corporation Method of spot-knocking an electron gun assembly in a color television picture tube
JPS6273526A (ja) * 1985-09-27 1987-04-04 Hitachi Ltd けい光ランプの封入ガス圧力測定方法
US4720652A (en) * 1987-01-20 1988-01-19 Cooper Industries, Inc. Sealed beam headlamp and method for testing its serviceability

Also Published As

Publication number Publication date
EP0426237A3 (en) 1991-11-21
EP0426237A2 (fr) 1991-05-08
DE3936015A1 (de) 1991-05-02
US5083957A (en) 1992-01-28
DE59005734D1 (de) 1994-06-23
JPH03165422A (ja) 1991-07-17

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